CA1163834A - Timing mechanism with selectable detent mechanism - Google Patents
Timing mechanism with selectable detent mechanismInfo
- Publication number
- CA1163834A CA1163834A CA000396254A CA396254A CA1163834A CA 1163834 A CA1163834 A CA 1163834A CA 000396254 A CA000396254 A CA 000396254A CA 396254 A CA396254 A CA 396254A CA 1163834 A CA1163834 A CA 1163834A
- Authority
- CA
- Canada
- Prior art keywords
- cam
- shaft
- notch
- timing mechanism
- pawl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Transmission Devices (AREA)
Abstract
TIMING MECHANISM WITH SELECTABLE
DETENT MECHANISM
Abstract of Disclosure A spring biased detent pawl cooperates with a cam to provide a starting point for the cam means of a timing mechanism. The pawl has three positions: (1) engaged with a profile of the cam, (2) engaged with a notch in the profile, and (3) disengaged from both the cam profile and the notch.
DETENT MECHANISM
Abstract of Disclosure A spring biased detent pawl cooperates with a cam to provide a starting point for the cam means of a timing mechanism. The pawl has three positions: (1) engaged with a profile of the cam, (2) engaged with a notch in the profile, and (3) disengaged from both the cam profile and the notch.
Description
~1638.~4 BACKGROUND OF THE INVENTION
Generally speaking, the present invention pertains to a timing mechanism which comprises an axially indexable shaft; cam means carried by and coupled to the shaft and including a cam having a cam profile and at least one notch in the cam profile; means coupled to the shaft applying rotation thereto; and detent means providing a starting point for rotation of the cam means including a spring biased pawl selectively operable to one of three positions: 1) engaged with the cam profile, 2) engaged with the notch, and 3) disengaged from both .the cam profile and the notch.
The present invention relates to a timing mechanism and more particularly to a detent means used in the timing mechanism to provide a selectable starting point of a program provided by the cam means of a timing mechanism Timing mechanisms have been used for many years in the appliance industry to control the functions of appliances such as washers, dryers, and dishwashers. In recent years because of the relatively large variety of applications, the timing mechanisms have provided a large variety of programs which the appliance operator may or may not wish to use at any given time. Therefore, the timing mechanisms usually provide some sort of detent means which permits the operator to manually select a desired startlng point in a program in situations where the complete program is not needed. Accordingly, the present invention relates to such a detent means.
OBJECTS OR FEATURES OF THE INVENTION
It is therefore, a feature of the present invention to provide a timing mechanism having a detent means to provide a starting point in a program of the timing mechanism. Another feature of the invention is to provide such a timing mechanism wherein there is a cam means having a cam with a cam profile and at least one notch in the cam profile 116;~E~34 and a spring biased detent pawl cooperating with the cam profile and - the notch to provide the starting point. Another feature of the invention is to provide such a timing mechanism wherein the detent pawl is actuated by the cam profile during a detenting mode and is further actuated by an axial indexing of a shaft carrying the cam means during a non-detenting mode. Still another feature of the invention is the provision of such a timing mechanism wherein the spring biased detent pawl is selectively operable to one of three positions: 1) engaged with the cam profile, 2) engaged with the notch, and 3) disengaged from both the cam profile and the notch. These and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
Figure 1 is a side view of a timing mechanism with portions removed to show the feature of the invention.
Figure 2 is an enlarged section taken along the line 2-2 of Figure 1.
Figure 3 is a view similar to Figure 2 showing the invention in a different operating mode.
Figures 4-6 are views showing the relationship between a detent pawl and a cam means of the timing mechanism in three different operating modes.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to Figure 1, there is shown a timing mechanism 10 which, in general, includes a cam means 12 which is carried on a shaft 14 the cam means being coupled to a motor drive means 16 through motor output pinion 18 and intermediate gearing 20. The manner in which the motor drive means is connected to the cam means does not form a part of the present invention and, therefore, for the sake of simplicity, is not shown in detail. As shown, the cam means is housed in a ~16~34 housing 22 which includes end plates 24 and 26 and in which shaft 14 is rotatably journalled and, as will be herein described, is also axially indexable. Although not shown, electrical switches engage cam means 12 to open and close electrical circuits to electrical .terminals 28. According to the present invention, there is provided a detent means 30 which permits an operator to manually set cam means 12 to a desired starting point for power driven rotation by motor drive means 16.
Referring now to Figure 2, cam means 12 includes a plurality of .cams 32 which are integrally constructed with a hub portion 34 that is rotatably journalled on shaft 14. Hub 34 includes a yake portion 36 having oppositely disposed slots 38 through which legs 40 and 42 of hub 44 extend. Hub 44 is fixed to shaft 14 through cooperating splines 46. Thus, rotation of cam means 12 causes rotation of shaft 14 through the cooperation of hubs 34 and 44. Shaft 14 is axially indexable within hub 34 to one of two positions determined by spring detent 48 engaging either one of grooves 50 or 52 of shaft 14.
Referring to Figure 2 and any one of Figures 4-6, cam means 32 1ncludes cam 54 which has a cam profile 56 and at least one notch 58.
Cam 54 cooperates with detent means 30 to provide a starting point from which cam means 12 can be rotated. Detent means 30 includes a spring biased detent pawl 60 which slideably engages a slot 62 of plate 24 and which is guided through tabs 64 and 66 riding on the plate. As shown, detent pawl 60 includes a ramp portion 68 which engages the ramp means 70 provided on hub 40. The detent pawl is axially spring biased through a coil spring 72 which is carr~ed on a tab 74 which extends from the cut-away edge 76 of plate 24 and a tab 75 which extends from the pawl.
As shown, the coil spring engages an end of a detent pawl 60 and cut-away edge 76. The detent pawl also includes a tongue 78 which engages cam 54 of cam means 32. As will be hereinafter explained, the detent ~6~.34 pawl is selectively operable in three positions through either a manual indexing of shaft 14 or the cam profile 56 of cam 54.
The operation of the detent means 30 with respect to cam means 12 and especially cam 54 can now be described. Starting with Figure 4, tongue 78 is engaged with cam profile 56. The appliance operator manually turns shaft 14 and thus cam means 12 through a handle (not shown) carried on the end 14a of the shaft (Figure 1) until a desired notch 58 is engaged by the tongue 78 (detenting mode) as shown in Figures 3 and 5. It is understood that the operator is able to manually turn the shaft by overriding motor drive means 16 through a clutch in the intermediate gearing 20 located between the motor means and the cam means in a manner well known in the art. If the first notch engaged by the tongue does not represent the desired starting point, the operator is able to continue rotation of the cam means by virtue of the tongue riding out of the notch through ramp 59.
Once the desired starting point is reached, the operator pulls the shaft 14 "out" to index the shaft to the position shown in Figure 2 where, as shown, ramp 70 has caused detent pawl 60 to move "out" through engagement with ramp 68 of the pawl. Such movement of the pawl causes disengagement of the tongue 78 from both notch 58 and cam profile 56 (non-detenting mode, Figure 6). Electrical power is then applied to the ~iming mechanism until the desired cycle is completed. Upon completion, the operator then pushes shaft 14 "in" to disengage ramps 68 and 70 and permit the pawl and tongue 78 to return to the position of Figure 4.
Generally speaking, the present invention pertains to a timing mechanism which comprises an axially indexable shaft; cam means carried by and coupled to the shaft and including a cam having a cam profile and at least one notch in the cam profile; means coupled to the shaft applying rotation thereto; and detent means providing a starting point for rotation of the cam means including a spring biased pawl selectively operable to one of three positions: 1) engaged with the cam profile, 2) engaged with the notch, and 3) disengaged from both .the cam profile and the notch.
The present invention relates to a timing mechanism and more particularly to a detent means used in the timing mechanism to provide a selectable starting point of a program provided by the cam means of a timing mechanism Timing mechanisms have been used for many years in the appliance industry to control the functions of appliances such as washers, dryers, and dishwashers. In recent years because of the relatively large variety of applications, the timing mechanisms have provided a large variety of programs which the appliance operator may or may not wish to use at any given time. Therefore, the timing mechanisms usually provide some sort of detent means which permits the operator to manually select a desired startlng point in a program in situations where the complete program is not needed. Accordingly, the present invention relates to such a detent means.
OBJECTS OR FEATURES OF THE INVENTION
It is therefore, a feature of the present invention to provide a timing mechanism having a detent means to provide a starting point in a program of the timing mechanism. Another feature of the invention is to provide such a timing mechanism wherein there is a cam means having a cam with a cam profile and at least one notch in the cam profile 116;~E~34 and a spring biased detent pawl cooperating with the cam profile and - the notch to provide the starting point. Another feature of the invention is to provide such a timing mechanism wherein the detent pawl is actuated by the cam profile during a detenting mode and is further actuated by an axial indexing of a shaft carrying the cam means during a non-detenting mode. Still another feature of the invention is the provision of such a timing mechanism wherein the spring biased detent pawl is selectively operable to one of three positions: 1) engaged with the cam profile, 2) engaged with the notch, and 3) disengaged from both the cam profile and the notch. These and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
Figure 1 is a side view of a timing mechanism with portions removed to show the feature of the invention.
Figure 2 is an enlarged section taken along the line 2-2 of Figure 1.
Figure 3 is a view similar to Figure 2 showing the invention in a different operating mode.
Figures 4-6 are views showing the relationship between a detent pawl and a cam means of the timing mechanism in three different operating modes.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to Figure 1, there is shown a timing mechanism 10 which, in general, includes a cam means 12 which is carried on a shaft 14 the cam means being coupled to a motor drive means 16 through motor output pinion 18 and intermediate gearing 20. The manner in which the motor drive means is connected to the cam means does not form a part of the present invention and, therefore, for the sake of simplicity, is not shown in detail. As shown, the cam means is housed in a ~16~34 housing 22 which includes end plates 24 and 26 and in which shaft 14 is rotatably journalled and, as will be herein described, is also axially indexable. Although not shown, electrical switches engage cam means 12 to open and close electrical circuits to electrical .terminals 28. According to the present invention, there is provided a detent means 30 which permits an operator to manually set cam means 12 to a desired starting point for power driven rotation by motor drive means 16.
Referring now to Figure 2, cam means 12 includes a plurality of .cams 32 which are integrally constructed with a hub portion 34 that is rotatably journalled on shaft 14. Hub 34 includes a yake portion 36 having oppositely disposed slots 38 through which legs 40 and 42 of hub 44 extend. Hub 44 is fixed to shaft 14 through cooperating splines 46. Thus, rotation of cam means 12 causes rotation of shaft 14 through the cooperation of hubs 34 and 44. Shaft 14 is axially indexable within hub 34 to one of two positions determined by spring detent 48 engaging either one of grooves 50 or 52 of shaft 14.
Referring to Figure 2 and any one of Figures 4-6, cam means 32 1ncludes cam 54 which has a cam profile 56 and at least one notch 58.
Cam 54 cooperates with detent means 30 to provide a starting point from which cam means 12 can be rotated. Detent means 30 includes a spring biased detent pawl 60 which slideably engages a slot 62 of plate 24 and which is guided through tabs 64 and 66 riding on the plate. As shown, detent pawl 60 includes a ramp portion 68 which engages the ramp means 70 provided on hub 40. The detent pawl is axially spring biased through a coil spring 72 which is carr~ed on a tab 74 which extends from the cut-away edge 76 of plate 24 and a tab 75 which extends from the pawl.
As shown, the coil spring engages an end of a detent pawl 60 and cut-away edge 76. The detent pawl also includes a tongue 78 which engages cam 54 of cam means 32. As will be hereinafter explained, the detent ~6~.34 pawl is selectively operable in three positions through either a manual indexing of shaft 14 or the cam profile 56 of cam 54.
The operation of the detent means 30 with respect to cam means 12 and especially cam 54 can now be described. Starting with Figure 4, tongue 78 is engaged with cam profile 56. The appliance operator manually turns shaft 14 and thus cam means 12 through a handle (not shown) carried on the end 14a of the shaft (Figure 1) until a desired notch 58 is engaged by the tongue 78 (detenting mode) as shown in Figures 3 and 5. It is understood that the operator is able to manually turn the shaft by overriding motor drive means 16 through a clutch in the intermediate gearing 20 located between the motor means and the cam means in a manner well known in the art. If the first notch engaged by the tongue does not represent the desired starting point, the operator is able to continue rotation of the cam means by virtue of the tongue riding out of the notch through ramp 59.
Once the desired starting point is reached, the operator pulls the shaft 14 "out" to index the shaft to the position shown in Figure 2 where, as shown, ramp 70 has caused detent pawl 60 to move "out" through engagement with ramp 68 of the pawl. Such movement of the pawl causes disengagement of the tongue 78 from both notch 58 and cam profile 56 (non-detenting mode, Figure 6). Electrical power is then applied to the ~iming mechanism until the desired cycle is completed. Upon completion, the operator then pushes shaft 14 "in" to disengage ramps 68 and 70 and permit the pawl and tongue 78 to return to the position of Figure 4.
Claims (3)
1. A timing mechansim comprising an axially indexable shaft;
cam means carried by and coupled to said shaft and including a cam having a cam profile and at least one notch in said cam profile; means coupled to said shaft applying rotation thereto; and detent means providing a starting point for rotation of said cam means including a spring biased pawl selectively operable to one of three positions:
1) engaged with said cam profile, 2) engaged with said notch, and 3) disengaged from both said cam profile and said notch.
cam means carried by and coupled to said shaft and including a cam having a cam profile and at least one notch in said cam profile; means coupled to said shaft applying rotation thereto; and detent means providing a starting point for rotation of said cam means including a spring biased pawl selectively operable to one of three positions:
1) engaged with said cam profile, 2) engaged with said notch, and 3) disengaged from both said cam profile and said notch.
2. A timing mechanism according to claim 1 further including ramp means carried by said shaft and engaging said spring biased pawl.
3. A timing mechanism according to claim 2 wherein said pawl is slideably carried in a plate of a housing for said timing mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27874081A | 1981-06-29 | 1981-06-29 | |
| US06/278,740 | 1981-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1163834A true CA1163834A (en) | 1984-03-20 |
Family
ID=23066149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000396254A Expired CA1163834A (en) | 1981-06-29 | 1982-02-15 | Timing mechanism with selectable detent mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1163834A (en) |
-
1982
- 1982-02-15 CA CA000396254A patent/CA1163834A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |